An Invisible Undershirt Under Suits and Light Shirts
Short answer: An undershirt under a light shirt should not show, and that comes down to colour, neckline and fit. Choose a tone close to your skin, a neckline that sits below the shirt collar, and a cut that does not form creases. Here is how.
Why the undershirt often shows
Under a light shirt an undershirt easily shows through, because the fabric is thin and lets light pass. White is exactly the colour that shines through most, and the edge of the neckline can show clearly. An invisible undershirt is therefore mostly about colour, neckline and fit.
Choose a colour close to your skin
The best advice is to choose a colour that resembles your skin rather than white. A skin-toned undershirt disappears behind the shirt fabric, while a white one shows up as a light patch. If your skin is darker, choose the tone closest to your own, and try it under the shirt before wearing it for anything important.
The neckline must sit below the collar
Choose an undershirt where the neck is deep enough that it does not peek above the open button of the shirt. A V-neck is often the safest choice, because it follows the opening of the shirt. A bamboo undershirt for men in a V-neck version is a good place to start, and you can compare shapes and colours there.
Fit under the shirt
An undershirt should sit close enough that it does not form creases under the shirt, but not so tight that it pulls across the chest. Check the length, so it can stay tucked into the trousers without riding up when you move. An undershirt that creeps up is often the cause of an uneven line over the stomach.
For suits and office days
Under a suit and shirt the undershirt should be thin and smooth, so it does not add bulk. Combine it with bamboo underpants for men, so the waistband does not draw an edge under the trousers. Remember that you often sit for many hours, so the fit should be comfortable when seated too.
Shirt colour and fabric matter
The lighter and thinner a shirt is, the more can be seen through it. A shirt in a denser fabric or a darker colour hides more, while a thin white shirt almost always calls for a skin-toned undershirt. Try the shirt in front of a window or a lamp to see how much light it lets through.
Alternatives for cold days
On a cold day you can use a long-sleeved T-shirt as an extra layer instead of an undershirt. Choose a thin one, so it does not bunch up under the shirt sleeves. A bamboo long sleeve T-shirt for men can work as a layer, but check that the sleeves do not show at the cuff.
How the undershirt keeps its colour
Wash the undershirt according to the care label, and together with clothes of the same colour, so it does not discolour. Avoid high heat and strong detergents, because they can fade a skin-toned undershirt, so it no longer matches the skin. Dry it flat, and replace it when the colour has become uneven.
Frequently asked questions
Which colour is least visible under a white shirt?
A colour close to your skin is least visible, because it does not form a light patch behind the fabric. White usually shines through more, especially under thin shirts.
Should the undershirt have a V-neck or a crew neck?
A V-neck is often safest when the top shirt button is open, because it does not peek out. A crew neck works if the shirt is buttoned up to the collar.
How do I avoid creases under the shirt?
Choose an undershirt in the right size and tuck it into the trousers. It should fit close without pulling, so it does not form creases when you move.
